# Number Talk Part 1

## number talk part 1

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Fran Dickinson and his students had done two previous number talks involving “guess my rule?” The difference in this day’s number talk was the graphing of the coordinate values. In his planning, Dickinson and his colleagues decided to set parameters for the learner guesses to keep all of the points in the first quadrant. They had only recently begun investigating coordinate pairs and they thought it would simplify things to have the learners focus. During the number talk, students share different opinions of how to state the rule. Dickinson and his students model “silent signals” for showing agreement and disagreement with one another’s thinking.

## number talk part 1

5th - 6th Grade Math - Guess My Rule
Fran Dickinson, San Carlos Charter Learning Center, San Carlos School District, San Carlos, California

Next Up:   Number Talk Part 2

Video Transcript

STUDENT: 10.

FRAN DICKINSON: 10! All right. Would you like to come and plot that?

STUDENT: ¿Qué pasa? (What’s happening?)

FRAN DICKINSON: You can pass. You want to pass? Can someone come and plot this point on our graph right here? Put it on the graph where you think it goes. Maybe somebody else can think of another point for us. Another x value. You know what? David, before we go on to that, can you just explain to us how you placed your dot there?

STUDENT: So I went, 10. To 10 on the x, and then I went 27, right here.

FRAN DICKINSON: Very good. Thank you. Another x value. Guess my rule. Kelcey.

STUDENT: 6.

FRAN DICKINSON: Can I see thumbs-up, who thinks they know what the rule is at this point? All right. Let’s guess another number then. Let’s guess another number. This time I want you to continue guessing an x, I don’t think we’re ready to guess a y value yet. Give me an x. Megan.

STUDENT: 20.

FRAN DICKINSON: Okay. 20. Now, I’m not gonna let 20 happen, because I gave you parameters earlier, so, Megan, can you give me a different number that’s in between 0 and 10?

STUDENT: 8.

FRAN DICKINSON: 8. Good guess. Y value. Who thinks they have a y value? That will work with my rule? Uh, Zack.

STUDENT: Um, 13. Wait. 13, yeah. Wait, 12. Yeah. Yeah, 12.

FRAN DICKINSON: 12? Okay. 12. Let me see, hm.

STUDENT: 5 times 3 is 15, minus 3. Is 12.

FRAN DICKINSON: Does someone want to plot this point on our graph? Very good! Griffin, do you have a question or a comment?

STUDENT: Uh, I was gonna say an output

FRAN DICKINSON: An output number?

STUDENT: Yeah.

FRAN DICKINSON: All right. So am I to understand that you think you know what the rule is, then? All right. Can I see a show of thumbs, how many people feel they know. Just tight to your chest so I can see what’s going on. Thumbs up, thumbs down if you don’t know it. Thumbs in the middle if you’re almost there, not sure. All right, let’s do one more point, then. Griffin’s going to give us a y value. And remember, that x value’s gonna be in between 0 and 10. Uh, pardon me, greater than or equal to 0. Less than or equal to 10.

STUDENT: 0.

FRAN DICKINSON: 0. So your x is 0.

STUDENT: No, y.

FRAN DICKINSON: Y is…

STUDENT: Wow, I’m surprised that will go.

STUDENT: No, that’s impossible!

FRAN DICKINSON: I hear somebody whispering… is 0 a possibility for this? Can you guys turn to your partner?